Catwalker

Well, 2019 is quickly drawing to a close, it feels like only yesterday that 2018, and 2017 before it were quickly drawing to a close. My how time flies faster and faster as you get older.

Happy New Year Everybody!

新年あけましておめでとうございます！

Merry Christmas, all!

皆さん、　メリークリスマス！

Not the number kind, but finger kind...

I love watching how-to videos on Youtube, I think it's actually an addiction...
But, I am seeing things among carpentry videos and metal-working videos which make me cringe. Safety, or a lack thereof... I wonder how many of these people will be missing portions of their hands in the future?

Get safe, pay attention, and THINK BEFORE cutting!

じゃまた

Wow, I've actually written more postings this year than last! :)

Things are looking up. I hope to get a few more posts up before the New Year. Maybe a couple tied in to my Youtube channel. (Located here: number6of1) Keep your eyes peeled - I want to get my latest project complete and up here in the next week or so.

じゃまた

I once made the mistake of calling boxing barbaric to someone who was obviously a boxing fan...
Well, once again, I have been proved correct.

27-Year-Old dies of traumatic brain injury in the ring...

I stand by my statement that boxing is barbaric.

A sign of human depravity.

じゃまた

Here is what LTSpice says the response should be...

Not that different from what you see on the scope in the previous post.



















Of course, LTSpice assumes perfection in everything from parts values to wiring to solder joints...

じゃまた

So, I asked if anyone could figure out my next project...

Corrected schematic:

Sorry that the connectors are not
quite right, couldn't find any Ac wall
plugs or line cords in Kicad...

Here's a PCB layout...
What is it?



Anyone guess?

 Board etched and tinned, a
coil off to the side...

(Along with my reading glasses, I hate getting old(er)  ;) )









Circuit board complete...







Any ideas yet?



Box with two of the coils mounted...

10 uH each (approximately)

Box is 10" x 10"










Almost there...

Some pretty thick wire...











Generating a signal into the input
and watching the output on a scope.

Input starting at about 100 Hz
and sweeping to about 100 Khz

Here it is...


What is it?

A Brute-Force Line Filter,
Containing a common mode choke.
Hopefully, to help deal with the
cheap switching wall warts which
pollute the airwaves so much. :/



On to the next project (circuit board with toner layout in the last shot.)


じゃまた

Well, here it is going back together.

Vertical elements reassembled, not wound yet.














 Antenna temporarily reassembled, ready to solder leads onto coils.













3D printed brackets to hang the antenna.
Final assembly, mounted and ready for testing! And almost invisible unless you are looking for it!

Sweet.










Watch for me on 40 and 80!
じゃまた

So time to cut tubes and remove tape and windings.













Tape and windings removed, sticky...











じゃまた

Time to assemble some coils.

So here are the coils on their mountings, wound and connected to brass fittings:

You see a lot of real-estate above and below the coils, that is structural.















You can see here how the coil and structural components fit inside of the 2" vac tubes.

I haven't cut anything yet, this picture is with left over vac tube.












じゃまた